Air quality measurement apparatus, namely, particle counters; Pollutant sensors; Pressure sensors; Temperature sensors; Electric sensors; Odor sensors; Particulate matter (PM) sensors; Scientific instrumentation for measuring formaldehyde, carbon dioxide, volatile organic compounds, nitrogen gases, temperature, pressure, humidity, sound pressure level, ambient light

'air':1 'ambient':40 'apparatus':4 'carbon':27 'compound':31 'counter':7 'dioxid':28 'electr':14 'formaldehyd':26 'gase':33 'humid':36 'instrument':23 'level':39 'light':41 'matter':19 'measur':3,25 'name':5 'nitrogen':32 'odor':16 'organ':30 'particl':6 'particul':18 'pm':20 'pollut':8 'pressur':10,35,38 'qualiti':2 'scientif':22 'sensor':9,11,13,15,17,21 'sound':37 'temperatur':12,34 'volatil':29

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